Journal
SMALL
Volume 15, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804526
Keywords
band gap; graphene nanoribbons; on-surface synthesis; scanning tunneling microscopy; spectroscopy
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21527805, 21673154, 21790053]
- Ministry of Science and Technology [2017YFA0205002]
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Armchair graphene nanoribbons (AGNRs) with 8 and 10 carbon atoms in width (8- and 10-AGNRs) are synthesized on Au (111) surfaces via lateral fusion of nanoribbons that belong to different subfamilies. Poly-para-phenylene (3-AGNR) chains are pre-synthesized as ladder ribbons on Au (111). Subsequently, synthesized 5- and 7-AGNRs can laterally fuse with 3-AGNRs upon annealing at higher temperature, producing 8- and 10-AGNRs, respectively. The synthetic process, and their geometric and electronic structures are characterized by scanning tunneling microscopy/spectroscopy (STM/STS). STS investigations reveal the band gap of 10-AGNR (2.0 +/- 0.1 eV) and a large apparent band gap of 8-AGNRs (2.3 +/- 0.1 eV) on Au (111) surface.
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